<?php
namespace common\models\utils;
/**
 * UUID class
 *
 * The following class generates VALID RFC 4211 COMPLIANT
 * Universally Unique IDentifiers (UUID) version 3, 4 and 5.
 *
 * UUIDs generated validates using OSSP UUID Tool, and output
 * for named-based UUIDs are exactly the same. This is a pure
 * PHP implementation.
 *
 * @author Andrew Moore
 * @link http://www.php.net/manual/en/function.uniqid.php#94959
 */
class UUID {

    /**
     * Generate v3 UUID
     *
     * Version 3 UUIDs are named based. They require a namespace (another
     * valid UUID) and a value (the name). Given the same namespace and
     * name, the output is always the same.
     *
     * @param uuid $namespace
     * @param string $name
     */
    public static function v3($namespace, $name) {
        if (!self::is_valid($namespace))
            return false;

// Get hexadecimal components of namespace
        $nhex = str_replace(array('-', '{', '}'), '', $namespace);

// Binary Value
        $nstr = '';

// Convert Namespace UUID to bits
        for ($i = 0; $i < strlen($nhex); $i+=2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }

// Calculate hash value
        $hash = md5($nstr . $name);

        return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
                substr($hash, 0, 8),
// 16 bits for "time_mid"
                substr($hash, 8, 4),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 3
                (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
                (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for "node"
                substr($hash, 20, 12)
        );
    }

    /**
     *
     * Generate v4 UUID
     *
     * Version 4 UUIDs are pseudo-random.
     */
    public static function v4() {
        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low"
                mt_rand(0, 0xffff), mt_rand(0, 0xffff),
// 16 bits for "time_mid"
                mt_rand(0, 0xffff),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
                mt_rand(0, 0x0fff) | 0x4000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
                mt_rand(0, 0x3fff) | 0x8000,
// 48 bits for "node"
                mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
        );
    }

    public static function shortCode() {
        return sprintf('%04x%04x%04x', mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff));
    }

    public static function char_16() {
        return sprintf('%04X%04x%04X%04x', mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff),mt_rand(0, 0xffff));
    }

    public static function char_32() {
        return sprintf('%04X%04x%04X%04x04X%04x%04X%04x', mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff),mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff),mt_rand(0, 0xffff));
    }

    /**
     * Generate v5 UUID
     *
     * Version 5 UUIDs are named based. They require a namespace (another
     * valid UUID) and a value (the name). Given the same namespace and
     * name, the output is always the same.
     *
     * @param uuid $namespace
     * @param string $name
     */
    public static function v5($namespace, $name) {
        if (!self::is_valid($namespace))
            return false;

// Get hexadecimal components of namespace
        $nhex = str_replace(array('-', '{', '}'), '', $namespace);

// Binary Value
        $nstr = '';

// Convert Namespace UUID to bits
        for ($i = 0; $i < strlen($nhex); $i+=2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }

// Calculate hash value
        $hash = sha1($nstr . $name);

        return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
                substr($hash, 0, 8),
// 16 bits for "time_mid"
                substr($hash, 8, 4),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 5
                (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
                (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for "node"
                substr($hash, 20, 12)
        );
    }

    public static function is_valid($uuid) {
        return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?' .
                        '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
    }

}
